I-5/SR 16 Nalley Valley Interchange

Reconstruction of the Nalley Valley interchange is part of a series of projects to reduce congestion, improve safety and add HOV lanes in Pierce County. The eastbound viaduct work will move all eastbound SR 16 traffic onto a new and improved eastbound viaduct structure with a new ramp between South Sprague Avenue and eastbound SR 16. This project received $7.8 million from the American Recovery and Reinvestment Act to accelerate preliminary engineering. 

This project will provide several benefits and improvements on eastbound SR 16 across Nalley Valley.

  • Widened shoulders, improved ramp alignments and curves, and improved lighting will increase safety.
  • The interchange will provide additional capacity to improve traffic flow and reduce conflicting traffic movements or weaving areas.
  • Environmentally, the project will improves stormwater treatment and restore wetlands at the Tacoma Nature Center.
  • Additionally, the project will add several Intelligent Transportation System features, such as traffic cameras, electronic signage, highway advisory radio capacity and traffic data collectors.

The eastbound viaduct and the ramp from southbound Sprague Avenue to eastbound SR 16 is scheduled to open to eastbound traffic in 2013.



KLB Construction

Elcon Corporation

Tucci & Sons, Inc.

John Wayne Construction

Salinas Saw Cutting

Northwest Cascade, Inc.

Pacific Pile & Marine

Gary Merlino Construction, Co.

Commercial Fence Corp.

RW Rhine, Inc.

Wilson Concrete

Location:Tacoma, WA
Contractor:Guy F. Atkinson Construction, LLC.
Owner(s):Washington State Department of Transportation
Cost:$120.1 million